Show no fear. Start with STEM activities you like to do so that they see and feel your excitement.

Don't be afraid to fail. If the experiment you all try does not end with the expected results, work together to analyze the results. This attitude shows girls that they do not have to know everything to try science.

Move out of your comfort zone. Learn something new and share it with the girls.

Expose them to other professions through guests, volunteers, mentors and videos. Let STEM careers cross their radar over and over.

Fill the enviroment with good role models and make it welcoming. There are tons of resources for this from NCWIT, Engineer Girl, the National Women's History Project, to name just a few. Remember, you are combating years of television watching as you try to change each girl's self image.